function isDisabledBtn($btn) {
	if($btn.attr("disabled") == "disabled") {
		return true;
	}
	return false;
}

function disabledBtn($btn) {
	$btn.removeClass("blue-button");
	$btn.addClass("gray-button");
	$btn.attr("disabled","disabled");
}

function activeBtn($btn){
	$btn.removeClass("gray-button");
	$btn.addClass("blue-button");
	$btn.removeAttr("disabled");
}